If you already consider yourself a Sudoku master, and you’re looking for your next (and hopefully tougher) challenge, it might be time to give Kakuro a try. Kakuro puzzles are similar to crosswords, but use numbers instead of clues. The aim of the game is to fill in all of the blank squares using only the numbers 1-9, so that the numbers that you add in add up to the corresponding clues. Seems simple, but since each puzzle has only one unique solution, looks can surely be deceiving. Since it’s a great way to tune up your brain, and is the next logical step in the puzzle world, you’d better break out your pencils and get ready for the challenge, because Kakuro is coming.